501JCAM032768BAFR Equivalent & Substitute Parts

Part Overview

The 501JCAM032768BAFR is a 32.768 kHz CMEMS® LVCMOS oscillator manufactured by Silicon Labs, designed for low-frequency timing applications requiring enable/disable functionality. This part operates at 3.3V with a frequency stability of ±20ppm and is housed in a 4-SMD, No Lead package measuring 4.00mm x 3.20mm.

The 501JCAM032768BAFR has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently using this oscillator.

Substiute Parts

501JCAM032768BAFR

Silicon LabsIn Stock: 915501JCAM032768BAFR Datasheet

Current PartRFQ

KD3270040

Diodes IncorporatedIn Stock: 1826KD3270040 Datasheet

SimilarRFQ

SIT1533AC-H5-DCC-32.768G

SiTimeIn Stock: 1010SIT1533AC-H5-DCC-32.768G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 501JCAM032768BAFR is determined by the following critical parameters:

• Frequency Match: 32.768 kHz (exact match required)
• Output Compatibility: LVCMOS output standard
• Supply Voltage Compatibility: 3.3V operation capability
• Package Compatibility: 4-SMD, No Lead form factor
• Enable/Disable Function: Control capability for power management
• Base Resonator Type: MEMS or Crystal resonator technology

Both identified substitute parts meet these core substitution criteria. The KD3270040 uses crystal resonator technology while maintaining electrical and mechanical compatibility. The SIT1533AC-H5-DCC-32.768G employs MEMS resonator technology identical to the original part, with enhanced voltage range flexibility.

Parameter Comparison

Engineering Selection Recommendations

KD3270040 (Diodes Incorporated): This substitute provides active product status with extended operating temperature range (-40°C ~ 85°C) compared to the original part. It maintains identical supply voltage (3.3V) and package form factor. The crystal resonator technology delivers frequency stability of ±25ppm, slightly relaxed from the original ±20ppm specification. This part is ROHS3 compliant with MSL 1 rating, providing superior moisture handling characteristics. The KD3270040 is suitable for applications where extended temperature operation and long-term availability are priorities.

SIT1533AC-H5-DCC-32.768G (SiTime): This substitute employs MEMS resonator technology matching the original part's resonator type. It offers the widest supply voltage range (1.5V ~ 3.63V), providing design flexibility for multi-voltage systems. The significantly smaller footprint (2.00mm x 1.20mm) and lower profile (0.60mm) enable space-constrained applications. However, the frequency stability specification (+75ppm) is relaxed compared to the original part. This part is ROHS3 compliant with MSL 1 rating and active product status. The SIT1533AC-H5-DCC-32.768G is optimal for applications prioritizing compact form factor and voltage flexibility.

Both substitutes are actively manufactured and carry current compliance certifications, ensuring long-term supply chain viability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the KD3270040 directly replace the 501JCAM032768BAFR in existing designs?

A: The KD3270040 maintains electrical compatibility at 3.3V supply voltage and identical 32.768 kHz frequency output in LVCMOS format. The package footprint is mechanically compatible (4-SMD, No Lead). However, the KD3270040 measures 5.00mm x 3.20mm compared to the original 4.00mm x 3.20mm, requiring PCB layout verification. The frequency stability specification differs (±25ppm vs. ±20ppm), which must be evaluated against application timing requirements.

Q: What are the key differences between the two substitute parts?

A: The KD3270040 uses crystal resonator technology with extended temperature range (-40°C ~ 85°C) and tighter frequency stability (±25ppm). The SIT1533AC-H5-DCC-32.768G uses MEMS resonator technology with wider voltage range (1.5V ~ 3.63V) and significantly smaller dimensions (2.00mm x 1.20mm). The SIT1533AC-H5-DCC-32.768G lacks explicit enable/disable function specification, while the KD3270040 maintains this feature.

Q: Is the SIT1533AC-H5-DCC-32.768G suitable for applications requiring enable/disable control?

A: The SIT1533AC-H5-DCC-32.768G specification does not explicitly document enable/disable function capability. Applications requiring power management through oscillator enable/disable control should prioritize the KD3270040, which explicitly maintains this functionality.

Q: How do the frequency stability specifications affect component selection?

A: The original 501JCAM032768BAFR specifies ±20ppm frequency stability. The KD3270040 provides ±25ppm, acceptable for most 32.768 kHz timing applications. The SIT1533AC-H5-DCC-32.768G specifies +75ppm, which represents significant relaxation and is suitable only for applications with loose timing tolerances. Applications requiring precision timing should select the KD3270040.

Q: Are both substitute parts RoHS compliant?

A: Yes, both the KD3270040 and SIT1533AC-H5-DCC-32.768G are ROHS3 compliant. Both carry MSL 1 (Unlimited) moisture sensitivity ratings, providing superior handling characteristics compared to the original part's MSL 2 (1 Year) specification.

Q: What are the PCB layout considerations when substituting these parts?

A: The KD3270040 requires 1.00mm additional length (5.00mm vs. 4.00mm). The SIT1533AC-H5-DCC-32.768G requires significantly reduced footprint space (2.00mm x 1.20mm) and lower profile (0.60mm vs. 0.90mm). PCB layout verification is mandatory before component substitution to ensure pad alignment and clearance compliance.